61919799017 has 4 divisors (see below), whose sum is σ = 62532866436. Its totient is φ = 61306731600.

The previous prime is 61919798987. The next prime is 61919799043. The reversal of 61919799017 is 71099791916.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59195376601 + 2724422416 = 243301^2 + 52196^2 .

It is a cyclic number.

It is not a de Polignac number, because 61919799017 - 2⁸ = 61919798761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61919799047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306533558 + ... + 306533759.

It is an arithmetic number, because the mean of its divisors is an integer number (15633216609).

Almost surely, 2^61919799017 is an apocalyptic number.

It is an amenable number.

61919799017 is a deficient number, since it is larger than the sum of its proper divisors (613067419).

61919799017 is a wasteful number, since it uses less digits than its factorization.

61919799017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613067418.

The product of its (nonzero) digits is 1928934, while the sum is 59.

The spelling of 61919799017 in words is "sixty-one billion, nine hundred nineteen million, seven hundred ninety-nine thousand, seventeen".